I made a three surface airplane in XP11.25 by adding a wing object ahead of the CG and designating it an elevator. The control surface on the canard operates in opposition to that on the tail, as it should, but is always trimmed to create downforce no matter what I do. In flight, trimming to maximum nose up makes it just about neutral, with lots of downforce on the tail.
If I increase the canard angle of attack to get more lift, its elevator deflects to create more downforce, negating the angle increase. I know it makes negative lift by looking the lift vectors during flight. If I remove the elevator control on the canard, I can see positive lift on that surface.
The canard should be creating lift and unloading the tail when it contains an elevator control surface. Please let me know how this can be done.